A sudden increase in odd killings. A world close to an end gives rise to an unprecedented master detective!!! The story follows the motivated detective Asano Misaki & her slacker partner Hijirihara Takumi. They work in the Special Crime Investigation agency (SCI), which is in charge of cases judged abnormal or bizarre. In the middle of Chapter 3 of the series, it is revealed that Killer Killer is actually an official side story for the Danganronpa series, taking place after "Ultra Despair Girls - Danganronpa: Another Episode" and before "Super Danganronpa 2: Goodbye Despair Academy"